Free planning tools · Choose and fit a system

Off-grid toilet chooser

Compare toilet categories against your power, servicing and space arrangements using visible decision rules.

No account needed. Results update here as you change the inputs. Measurements stay in this tab unless you choose to share a link; shared links contain the inputs, including any location coordinates.

Your inputs

The starting values are examples. Replace them with your own measurements, prices or documented requirements.

What to have ready
  • Whether a suitable ventilation route and required power are available.
  • Verified liquid, solids and used-liner servicing arrangements.
  • Regular users and whether the installation is compact or generous.
Measurements for Off-grid toilet chooser

Calculated from your inputs

Your plan

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What to do next

    Calculation details

    Inputs used in this result

    Compare a change before committing

    Keep this plan, change the inputs and see the difference. The comparison stays in this tab.

    Which toilet categories deserve a closer look for your installation?

    Start with the space and servicing you can sustain, before looking at products. This off-grid toilet selector compares broad categories against your answers about power, ventilation, water and permitted waste destinations. Every check is visible.

    The shortlist helps a van conversion group or cabin owner discuss the same constraints. It does not decide that a household bin or drain is permitted, and it does not turn a category label into a model-specific installation recommendation.

    How to use this planner

    1. Answer from verified arrangements; use No when a route remains unresolved.
    2. Read the check list and trade-off for every category, not only the first result.
    3. Use the space, capacity and ownership tools before choosing an exact model.

    The calculation

    Categories are ordered by the number of unresolved example requirements, then by matched requirements. Each result shows its rules and trade-offs. User count prompts capacity checking; it does not invent a model capacity.

    A worked example

    With power, ventilation and separate disposal available but no flush water, urine-diverting waterless categories have fewer unresolved requirements than a water-flushed cassette.

    Example inputs are demonstrations. Replace them with your own measurements, prices or documented requirements.

    Assumptions and limits

    These are broad category screening rules, not product recommendations. Some models are passive or use different waste routes; read their manuals. An answer of Yes means you have verified a permitted route, not that any drain or household bin is suitable. Check capacity for your regular users and local arrangements before buying.

    Questions about this calculation

    Does the top category mean it is the best toilet to buy?

    No. It has fewer unresolved example requirements under the supplied answers. Exact models differ, including passive designs and alternative servicing routes, so read the actual manual.

    Why does the number of users not generate a product capacity?

    There is no universal category capacity. The user count reminds you to check real model capacity and your servicing interval instead of inventing a rating from the category name.

    Put the result in context

    From planning to choosing

    Does a ready-made portable toilet fit your plan?

    Use your own dimensions and servicing needs to judge the shortlist. Our Evo M desk review covers the fit checks; the comparison explains when a different layout makes more sense.

    Read the Trelino Evo M review

    Compare the three picks and current offers